Zero-4 Champ RR-Z

¥30 million:
Start a new game in story mode. Get to the dining room customization screen. Change the colors of the following objects in the dining room, in order: yellow wall, green curtain, yellow carpet, yellow sofa, and surreal poster.

Zero1 car:
Start a new game in story mode. Get to the dining room customization screen. Change the colors of the following objects in the dining room, in order: white wall, black curtain, black carpet, red sofa, and supercar poster. The Zero1 will now be unlocked at the showroom.

Fannicar:
Intentionally lose to the champion in the final race ten times. The Fannicar is now unlocked at the showroom.

Jet engine:
Start a new game in story mode. Enter Do-H-Ga-Me in Hiragana as a name. Then in the dining room, select the "Use Item" option to access the "Jetoenjin" feature.

Mahjong contest items:
Start a new game in story mode. Enter Ron-Ron-Ron in Katakana as a name. Then in the dining room, select the "Use Item" option to access all items needed to win the Mahjong contest.

Cannot lose RPG battles:
Start a new game in story mode. Enter Go-Bu-Rin in Hiragana as a name.

Mini-story mode:
Successfully complete story mode.